LM7909
The LM7909 is a linear voltage regulator IC manufactured by National Semiconductor, now part of Texas Instruments. It is part of the LM79xx series of negative voltage regulators. Specifically, the LM7909 provides a fixed output voltage of -9 volts. It is designed to accept a wider range of input voltages than some other regulators and offers built-in thermal overload protection and short-circuit current limiting.
This regulator is a three-terminal device, typically housed in a TO-220 or TO-3 package. The three terminals
Applications for the LM7909 include power supplies for negative voltage rails in various electronic circuits, such